| Semiodera glabra Treadwell, 1928 |
| Semiodera glynni Salazar-Vallejo, 2012 |
| Semiodera inflata (Treadwell, 1914) |
| Semiodera roberti Hartman, 1951 |
| Semiodera salazarae Salazar-Vallejo, 2012 |
| Semiodera tovarae Salazar-Vallejo, 2012 |
| Siphonostoma Otto, 1821 |
| Siphonostoma villosum Rathke, 1843 |
| Siphonostomum Grube, 1859 |
| Siphonostomum cariboum Grube & Örsted, 1859 |
| Siphostoma Otto, 1821 |
| Stylarioides Delle Chiaje, 1831 |
| Stylarioides capensis (McIntosh, 1885) |
| Stylarioides capensis var. americana Monro, 1928 |
| Stylarioides dubius Treadwell, 1929 |
| Stylarioides glabra (Treadwell, 1928) |
| Stylarioides inflata (Treadwell, 1914) |
| Stylarioides papillosa Essenberg, 1922 |
| Stylarioides plumosa (O.F. Müller, 1776) |
| Stylarioides pluribranchiata Moore, 1923 |